If you’re using Docker Desktop this will already have been done for you for the most common platforms. If there are, it will pass the executable to the application.įor this to work, we need to register the platforms we’re interested in with the kernel. one for a different architecture), it will check with the handler if there any “user space applications” configured to deal with the format (i.e. When Linux encounters an executable file format it doesn’t recognise (i.e. The QEMU integration relies on a Linux kernel feature with the slightly cryptic name of the binfmt_misc handler. With the recent buildx work, it’s easier than ever to use QEMU with Docker. There’s a fantastic project called QEMU that can emulate a whole bunch of platforms. Let’s start by looking at the first option, emulation. Interestingly, I’ve found that a blend of the two options can work best. So what can we do instead? There’s two more options: 1) emulate the target platform or 2) cross-compile. More common platforms like Raspberry Pis and IoT devices are typically limited in power and are slow or incapable of building images. This can work in a lot of cases, but if you’re targetting s390x, I hope you have access to an IBM mainframe (try Phil Estes, as I’ve heard he has several in his garage). So how can you build images for these other platforms? The most obvious way is simply to build the image on the target platform itself. Users of these platforms are typically building their own images or finding another solution. This is a substantial audience – think of home-labs built from Raspberry Pis, companies producing IoT devices, organisations running on IBM mainframes and clouds utilising low-power arm64 chips.
This works for the majority of development machines and cloud providers but leaves users of other platforms out in the cold. If I didn’t provide images, others would end up rolling their own which would duplicate work and create maintenance issues.īy default, the Docker images we create run on the linux/amd64 platform.
Docker for mac not working on the guest vm install#
I’m the main developer of the open source Trow registry and Docker images are the primary way people install the tool. Adrian is a regular conference speaker and trainer and he has spoken at several events including KubeCon EU, DockerCon, CraftConf, TuringFest and GOTO Amsterdam.ĭocker images have become a standard tool for testing and deploying new and third-party software. He is currently developing Trow, a container image registry designed to securely manage the flow of images in a Kubernetes cluster.
Adrian is the author of “Using Docker,” published by O’Reilly Media.
This is a guest post from Docker Captain Adrian Mouat who is Chief Scientist at Container Solutions, a cloud-native consultancy and Kubernetes Certified Service Provider.
0 kommentar(er)
